JPH01235315A - Method of controlling superconducting coil - Google Patents

Abstract

PURPOSE:To stably control an increase and a decrease at a transition, to cut the side of an excitation power supply at a failure and to quickly regenerate the coil energy to the power supply by a method wherein, when a superconducting coil is to be excited, a power supply apparatus to execute stationary excitation and a power supply apparatus to execute excitation of a changed portion only are installed and outputs of the two apparatus are added. CONSTITUTION:A superconducting coil is normally controlled by an electric current instruction Ir. That is to say, a deviation of the electric current instruction Ir from a current feedback value IF after an electric current flowing through a superconducting coil 4 has been detected by a current transformer 4 and a detection circuit 14 is operated by an operation circuit 1; an output of a power supply apparatus 1 is controlled by its output. A changed-portion detection circuit 12 detects only a changed portion of the current instruction value Ir and the current feedback value IF. An operation circuit 2 is actuated by an output of the changed-portion detection circuit 12 and controls an output of a power supply apparatus 2. When any trouble is caused at the apparatus, this state is captured and a circuit breaker 3 is opened. The supply of energy from the power supply apparatus 1, 2 is cut; the coil energy is accumulated in a capacitor 6 and returned to a power supply 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling a superconducting coil that can quickly dissolve the superconducting coil during transient changes and can also be used in the event of an accident.

[Conventional technology]

The conventional device was used in the 1985 IEEJ Tokyo Branch Conference ``Study of Energy Transfer Device between Superconducting Coils'' or the JP-A 1983
0-175403 r Superconducting Device", it provides protection and detection of quenching where superconductivity becomes normal conductivity, and it stably supplies current with two power sources. Furthermore, no consideration is given to regenerating coil energy in the event of a malfunction.

[Problem to be solved by the invention]

The conventional technology focuses on the steady state, that is, applying excitation to the superelectric coil stably and accurately, and does not mention methods for responding to changes during transients, methods for recovering energy in the event of an accident, etc.

The purpose of the present invention is to solve the problem of how to deal with transient changes in superconducting coils by providing a power supply device that operates during transient times, and in the event of an accident, by disconnecting the power supply device and connecting another power regeneration device. Operate this to regenerate energy.

[Means to solve the problem]

(2) The superconducting coil to be controlled is an inductance load, and its resistance value is zero.

In order to apply current to this, an ultra-precise power supply is required, but in order to increase or demagnetize the superconducting coil, responsiveness is required.

Therefore, it is effective to perform control by providing a power supply device that applies excitation in a steady state and a power supply device that performs transient magnetization and demagnetization.

2. In the event of a device malfunction, it is necessary to quickly remove the phenomenon caused by the malfunction by rapidly removing the excitation of the superconducting coil and regenerating energy. tIN
It is effective to provide V and perform power regeneration.

[Effect]

1. Detect the current flowing through the superconducting coil, detect the deviation between this and the current command value, and perform steady current control.
The control circuit is configured to include a control device and a control device that detects only a change during a transient period and performs current control only during a change, and performs good control both during a transient period and during a steady state.

2. Configure the circuit so that it can regenerate the energy of the superconducting coil by quickly disconnecting the excitation circuit with a circuit breaker in the event of an accident and connecting other power regeneration devices.

〔Example〕

FIG. 1 shows an embodiment comprising a current control system for exciting a superconducting coil.

1 is a power supply device (1) that supplies a steady current to the superconducting coil 4, and 2 is a power supply device (2) that supplies a transient current.
, 3 is a breaker that determines whether or not to supply the output of the power supply device (1) (2) to the superconducting coil 4, 5 is a current transformer that detects the current flowing through the superconducting coil 4, and 11 is a power supply device (1).
), 12 are change detection circuits that detect only changes in current, and 13 are calculation circuits (2) and 14 that control the power supply unit W (2) with the output of the change detection circuit. is a detection circuit that changes the output of the current transformer 5 to a calculation level.

Further, 6 is a capacitor that accumulates the energy of the superconducting coil, 7 is an inverter (INV) that regenerates the energy of the capacitor and the superconducting coil to a power source 9, and 8 is an insulating transformer.

Superconducting coils are normally controlled by current commands. That is, the calculation circuit (1) calculates the deviation between the current command ■ and the current feedback value IF detected by the current transformer 4 and the detection circuit 14 for the current flowing through the superconducting coil 4.
The output of the power supply device (1) is controlled by the output. -The force change detection circuit detects only the change in current command value I and current feedback value 1F. The output of the change detection circuit operates the arithmetic circuit (2) to control the output of the power supply device (2).

In this way, stable control is possible by providing a power supply device (1) that outputs a steady output and a power supply device (2) that outputs a transient output, and controlling the current of the superconducting coil by comparing their outputs. becomes.

In addition, it is important that the superconducting coils, which are controlled by the outputs of the power supplies (1) and (2), quickly release the energy stored in the superconducting coils in the event of a device failure to prevent the problem from expanding.

Therefore, breaker 3. Capacitor 6, power regeneration device (I
NV)7. An isolation transformer 8 is installed to regenerate energy.

When a malfunction occurs in the device, the condition is caught and the circuit breaker 3 is opened. When the cutoff rjI3 is opened, the supply of energy from the power supply devices (1) and (2) stops,
The energy of the coil is stored in a capacitor 6. The obtained energy is converted into alternating current by the power regeneration device WE (INV) 7 and returned to the power source 9 via the isolation transformer 8.

With such a circuit configuration, energy in the event of an abnormality can be quickly regenerated into the power supply, thereby preventing the problem from expanding.

FIG. 2 shows another embodiment of the invention.

The embodiment shown in FIG. 2 is an example implemented in a superconducting generator, and has a configuration in which the embodiment shown in FIG. 1 has a minor loop and a voltage control system as a major loop.

In addition to the configuration described in FIG. 1, there is a generator 18, a voltage transformer 17 that detects voltage, a voltage detector 16 that changes the output of the voltage transformer to a calculation level, and a voltage control circuit 1 that calculates deviation.
Consists of 5.

The terminal voltage of the generator is controlled by the voltage command value V, and the deviation between the command value Vr and the voltage feedback value VF is calculated by the voltage control circuit 15, and its output is the current command value I,
becomes.

The operation after the current command value is the same as that shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, since the power supply device (1) and the power supply device (2) are provided, the response can be continuously variably controlled without reducing the response during transient times.

Furthermore, since energy can be quickly recovered in the event of an accident, the spread of accidents can be minimized.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are block diagrams each showing an embodiment of the present invention. 1.2... Power supply device, 3... Breaker, 4... Superconducting coil, 5... Current transformer, 6... Capacitor, 7
...Inba 1---INN

Claims (2)

[Claims] 1. When excitation of a superconducting coil, a power supply device that excites during steady state and a power supply device that excites only the amount of change are provided.
A method for controlling a superconducting coil, characterized in that by adding the outputs of the two devices, stable control is performed during transient increases and decreases. 2. Claim 1: A method for controlling a superconducting coil equipped with a power regeneration device, which disconnects the excitation power source in the event of an accident and rapidly regenerates the energy of the superconducting coil to the power source.